Table 5.

Combination of sensors used in different research works.

Source	PIR	Reed Switch	Ultrasonic Sensor	Camera	Pressure Sensor	Microphone	Electrical Power Sensors	Flowmeter	Float Switch	RFID	Smartphone	Accelerometer
Huynh et al. [55]	✓	✓
Barsocchi et al. [56]	✓	✓			✓		✓
Lussier et al. [57]	✓	✓					✓
Gochoo et al. [58]	✓	✓
Dawadi et al. [59]	✓	✓
Kenfack Ngankam et al. [60]	✓	✓			✓		✓	✓
Pinard et al. [61]	✓	✓			✓		✓	✓
Pirzada et al. [62]		✓
Ghosh et al. [63]			✓
Seint et al. [64]				✓
Park et al. [65]				✓						✓
Cippitelli et al. [66]				✓
Zelun et al. [67]				✓
Vuegen et al. [68]						✓
Rebeen et al. [69]	✓	✓							✓
Ueda et al. [70]			✓				✓
Belley et al. [71]							✓
Fortin-Simard et al. [72]							✓			✓
Fortin-Simard et al. [73]										✓
Yunfei et al. [76]											✓
Tsang et al. [74]												✓
Charlon et al. [75]												✓